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Crystal Cave at Naica, Mexico

Explorers discover some of the largest mineral crystals ever seen.

Videos provided by National Geographic in promotion of their "Into the Lost Crystal Caves" program (October 10, 2010 at 8:00 PM ET/PT).

The Most Interesting and Most Dangerous Cave

Some of the largest mineral crystals ever discovered are in the Giant Crystal Caves of Naica, Mexico. The crystals in the cave are absolutely amazing. There are giant gypsum crystals up to 36 feet long that weigh over 50 tons.

However, visiting the cave is extremely dangerous. The cave has high temperature and high humidity conditions that would kill the unprepared person in a matter of minutes. Temperatures in the cave exceed 50 degrees Celsius (122 degrees Fahrenheit) and the humidity there is 100%

Video Topics

These three videos from National Geographic will show you how the first visit to the cave was made, the safety equipment that has been developed to protect visitors and a glimpse at how a visitor can easily get into desparate trouble less than one hundred yards from the cave entrance.

The videos were prepared to promote National Geographic's "Into the Lost Crystal Caves" program which will air on the National Geographic Channel, Sunday, October 10, 2010 at 8:00 PM ET/PT.

Barely Escaping With Your Life: This video shows how fragile human visitors are in the crystal cave environment. The high temperatures and humidity are a severe environment that make breathing and thinking difficult. Venturing just 100 yards from the entrance can be a very difficult and very dangerous journey.

First in the Cave: Climbers descend into a large-diameter mine shaft to make the first ever visit to the giant crystal cave.

Exploring a Deadly Cave: Special suits have been developed that attempt to keep cave visitors cool in the high temperature and high humidity environment of the crystal cave.

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